Way to connect MySQL with PDO method in PHP

PHP: connect to MySQL with PDO

<?php

	try{
		$db = new PDO("mysql:host=HOST_NAME;dbname=DB_NAME;port=PORT_NUM", "USER", "PASS");
		$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		$db->exec("SET NAMES 'utf8'");	
	} catch (Exception $e) {
		echo "Could not connect to database.";
		exit;
	}

	try {
		$results = $db->query("SELECT .. FROM .. WHERE ..");
	} catch (Exception $e) {
		echo "Something wrong!";
	}

	$results->fetchAll(PDO::FETCH_ASSOC);
?>